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+;;; Whispers --- Stealth VPN and ssh tunneler
+;;; Copyright © 2024 Runciter <runciter@whispers-vpn.org>
+;;;
+;;; This file is part of Whispers.
+;;;
+;;; Whispers is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; Whispers is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Whispers.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (whispers)
+  #:export (whispers))
+
+(define herd-path "/run/current-system/profile/bin/herd")
+
+(define (strip-final-slash path)
+  "Strip the last character of the string PATH if it is a slash, and return
+the resulting string."
+  (let ((lgth (string-length path)))
+    (if (equal? "/" (substring path (- lgth 1) lgth))
+        (substring path 0 (- lgth 1))
+        path)))
+
+(define* (whispers #:key
+                   (lieutenant "/")
+                   (act '("status")))
+  "Call an herd sub-process to command the whispers lieutenant at the
+whispers path LIEUTENANT to perform the shepherd action described by the
+list of strings ACT of the form either (ACTION) or (ACTION SERVICE
+. ARGS), in which ARGS is optionally the emtpy list."
+  (let ((lieut (strip-final-slash lieutenant)))
+    (apply system*
+           (append (list herd-path
+                         "-s"
+                         (string-append "/run/whispers"
+                                        lieut
+                                        "/unix-sockets/"
+                                        (basename (string-append "/whispers"
+                                                                 lieut))
+                                        ".sock"))
+                           act))))